Using slope intercept form

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Could somebody me with this radical simplification?

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?